Poppy's Devastating Charge doesn't stun under certain conditions

Vayne E – Condemn Fixed a bug where, if the target was being moved by a spell when Condemn's projectile hit (dash, knockup, knockback, pull, etc.) Condemn would sometimes not stun on collision with terrain.

Same bug, probably. It gets really annoying when Kallista uses her passive to jump into the wall, I slam her, and no stun. Same story on Nidalee's pounce and Riven's Q.